Re: Optimal toroid elevation

• To: tesla-at-pupman-dot-com
• Subject: Re: Optimal toroid elevation
• From: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Thu, 25 May 2000 16:50:30 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi Jeff,

> Original Poster: "Jeff W. Parisse" <jparisse-at-teslacoil-dot-com> 
> 
> Marco,
> 
> I have found that big coils work better if the primary is
> raised above ground by at least the diameter (i.e. a
> one meter diameter primary should be raised above
> the ground *at least* one meter.
> 
> I'm sure an engineer can give you the "why" this works.
> I'm guessing that the primary e-field shouldn't intersect
> with the ground plane as power is lost.

Exactly right. I once measured the raw Q of a primary (no gap) 
raised at different heights and the differences were very significant. 
       BTW - that suggestion about adjusting the height of the terminal 
was for *fine* tuning. I have used it in the past on medium sized 
coils.

Regards,
Malcolm

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